package com.ls;

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        "".replaceAll("","");
//        ArrayList.class;
        System.out.println(3/2);//1

        System.out.println(Integer.parseInt("1", 2));
        System.out.println(Integer.parseInt("001", 2));
    }
}
